Machining method for hollow body metal part

A technology of metal parts and processing methods, which is applied in the field of metal parts processing, can solve problems affecting the quality of sintered products, cracks in hollow body parts, and low production efficiency, and achieve the effects of uncomplicated process steps, high production efficiency, and high pass rate

Inactive Publication Date: 2017-12-26
江苏理成科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, metal injection molding technology is basically used to produce small solid mechanical parts, and there are the following problems in the production of hollow metal parts: because the hollow body parts are hollow, the preparation of powder injection molding technology has not yet broken through the key points Technology, can not be formed directly, only traditional technology can be used, the hollow body parts produced by traditional technology are prone to cracks, deformation, or even cannot be formed, which seriously affects the quality of sintered products, high scrap rate and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare hollow spheres with a diameter of 30 mm and a hollow diameter of 20 mm.

[0032] a. According to the drawing of the hollow sphere, take the axis of symmetry as the central axis, divide the hollow sphere into two sub-components (hemispheres), and draw the drawings of the sub-components respectively;

[0033] b. Make corresponding molds according to the drawings of sub-components;

[0034] c. Take 92% stainless steel powder by weight and 8% binder by weight and mix them uniformly at a temperature of 340°C for 55 minutes, and prepare feed granules at a temperature of 200°C;

[0035] d. Using an injection molding machine to inject feed particles into each mold to form a corresponding sub-component blank;

[0036] e. The sub-component blanks are welded and connected by a pistol-type ultrasonic welding machine, and a layer of sintered coating is applied to the weld joints of each sub-component blank. The sintered coating is the same metal as the part to be processed ...

Embodiment 2

[0039] An ellipsoid with a longest diameter of 40 mm and a shortest diameter of 20 mm is prepared.

[0040] a. According to the drawing of the hollow sphere, take the axis of symmetry as the central axis, divide the hollow sphere into two sub-components (semi-ellipsoids), and draw the drawings of the sub-components respectively;

[0041] b. Make corresponding molds according to the drawings of each sub-component;

[0042] c. Take 89% stainless steel powder by weight and 12% binder by weight and mix them uniformly at a temperature of 350°C for 58 minutes, and prepare feed granules at a temperature of 190°C;

[0043] d. Using an injection molding machine to inject feed particles into each mold to form a corresponding sub-component blank;

[0044] e. The sub-component blanks are welded and connected by a pistol-type ultrasonic welding machine, and a layer of sintered coating is applied to the weld joints of each sub-component blank. The sintered coating is the same metal as the ...

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Abstract

The invention relates to the technical field of metal part machining, in particular to a machining method for a hollow body metal part. The machining method comprises the steps that a, according to a drawing of a to-be-machined part, the part is divided into a plurality of sub parts, and drawings of all the sub parts are drawn; b, according to the drawings of all the sub parts, corresponding molds are manufactured; c, metal powder and a binder are evenly mixed and then are prepared into feeding particles; d, the feeding particles are injected into all the molds through an injection molding machine to from corresponding sub part blanks; e, all the sub part blanks are welded together, so that a part blank is constituted; and f, the part blank is placed in a sintering furnace to be subjected to degreasing sintering, and after sintering is completed, a finished product is obtained. According to the machining method for the hollow body metal part, the quality of a manufactured product is good, and the pass percent is high.

Description

technical field [0001] The invention relates to the technical field of metal parts processing, in particular to a method for processing hollow metal parts. Background technique [0002] Metal Injection Molding (MIM for short) is a new powder metallurgy molding technology derived from the plastic injection molding industry. As we all know, the production price of plastic injection molding technology is low, and it can produce products with various complex shapes, but the strength of plastic products is not high. In order to improve its performance, the strength and durability of products can be improved by adding metal or ceramic powder to plastic raw materials. Abrasive. In recent years, this idea has been developed to maximize the content of solid particles and completely remove the binder in the subsequent sintering process to densify the formed blank, that is, metal injection molding technology. The basic process steps of metal injection molding are: first select the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/11
CPCB22F3/225B22F3/11
Inventor 黄平
Owner 江苏理成科技有限公司
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